On Fri, 24 Oct 2014 16:38:40 -0700 <shane-kernel@xxxxxx> wrote: > Hello all, > > I was converting from a 2 disk raid1 array to a 4 disk raid5 (3+1s) in preparation to convert to a four disk raid6. I added the two additional component devices and did a: > Mdadm --grow /dev/md1 --level 5 --raid-devices 3 I guess you mean "to a 3 disk raid5 (2+1s)" ... > And off it went. I had a power failure a good ways in and now when the system boots, it runs the array, attempts to restart the reshape then disk IO locks up hard. > > I figure it is disk IO rather than a complete system lockup as I have about 10 seconds of interactive shell before it locks. If I enter a dmesg command then that command will succeed. After the lockup, subsequent dmesg commands succeed (dmesg is in cache) but another command such as ls will lock up. Cat /proc/mdstat shows the reshape in progress but it doesn't actually progress beyond the point at which the system locks. > > Booting from a USB stick, I tried: > Mdadm --assemble --readonly > But that too hangs the system. > > Do I have any recourse beyond just recreating the array and restoring from backup? Kernel is 3.16. Probably it can be fixed... Can you include the output of "mdadm -D" instead of just mentioning the command :-) Also "mdadm --examine" of each device. And "mdadm --version". And cat /proc/PID/stack for and PID which is in "D" state in 'ps'. NeilBrown
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